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Designing a Reference Architecture for Virtualized
Environments Using IBM System Storage N series
IBM Redbooks Solution Guide
The IBM® System Storage® N series Reference Architecture provides deployment guidelines, workload
estimates, and preferred practices for clients who want a proven IBM technology stack for VMware
environments. The result is a Reference Architecture for Virtualized Environments (RAVE) using VMware
vSphere, IBM System x® or BladeCenter® server, IBM System Networking, and IBM System Storage N
series as a storage foundation.
Figure 1 illustrates the Reference Architecture solution stack.
Figure 1. Reference Architecture solution stack
Designing a Reference Architecture for Virtualized Environments Using IBM System Storage N series
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Did you know?
The Reference Architecture can be also be used as a foundation to create dynamic cloud solutions and
make full use of underlying storage features and functions. This solution guide provides a blueprint that
illustrates how clients can create a virtualized infrastructure and storage cloud to help address current and
future data storage business requirements. It explores the solutions that IBM offers to create a storage
cloud solution addressing client needs.
Business value
The Reference Architecture for Virtualized Environments and the extensive experience of IBM in cloud
computing, services, proven technologies, and products support a Smart Storage Cloud solution designed
for your storage optimization efforts.
Clients face many common storage challenges, and some clients have variations that make them unique.
With RAVE, a proven and scalable solution has been created that consists of a rack of servers, storage,
and networking components. Thus, we have carefully sized three scenarios, Entry, Mainstream, and
Advanced, each based on preferred practices for real world workloads.
The IBM System Storage N series used as the storage foundation offers unified storage solutions that
provide industry-leading technologies in the areas of storage efficiencies, instantaneous virtual machine
and data store cloning for virtual servers and virtual desktops, and virtual data center backup and
business continuance solutions.
This information is intended for anyone who wants to learn how to successfully deploy a virtualized
environment, and to understand how IBM addresses data storage and compute challenges with IBM
System Storage N series solutions in conjunction with IBM servers and networking solutions. It is suitable
for IT Architects, Business Partners, IBM clients, storage solution integrators, and IBM specialist sales
representatives.
Solution overview
IBM System x and IBM System Storage N series with VMware vSphere as virtualization software offers
an architecture that can be easily sized to fit the needs of the SMB to enterprise clients. Each selected
architecture is a predefined, robust solution with immediate usability.
System x and N series with VMware vSphere 5 is a tested architecture and end-to-end solution that
comprises all parts of a future-ready data center in a modular, extensible, flexible, and scalable rack
server format. This format optimizes value in terms of providing dynamically changeable capability based
on changing user needs, ease of deployment, administration, support, expansion, and most importantly,
affordability. To support business agility, IT teams must have the ability to add or reduce resources such
as memory and disk storage capacity when required, to accommodate business demands by users. IBM
System x and IBM System Storage N series support this dynamic scaling of resources. Furthermore, the
combination of System x, N series, and VMware vSphere creates mutual benefits and enables the
creation of a dynamic cloud computing architecture.
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In addition to VMware vSphere, the following key infrastructure components provide the foundations for
this cloud computing architecture:

IBM System x3650M4, HS23, and HX5 servers are optimized to meet the virtualization management
and advanced workload demands of private cloud data centers.

The IBM N series N3xxx and N62xx Storage Systems were selected to bring high performance SAN
and NAS features in a unified system with efficiency features including deduplication and thin
provisioning. In addition, N series products offer data protection features for vSphere such as
no-performance-impact snapshots and thin replication for enabling and supporting disaster recovery
and business continuity.

IBM Storage Networking Gbps Ethernet components form the backbone for data and network
connectivity. The combination of high performance adapters and low latency, cut-through switches
enables the high-speed infrastructure that is critical for resource utilization and load balancing within
the cloud. To provide additional flexibility, clients can choose either IBM Fibre Channel (FC) or
Ethernet switches for their deployment.
Performance is a key consideration to support the virtualization and elasticity requirements. Reliability and
high availability are of paramount importance when designing architectures that offer cloud services. The
following section provides information about three reference configurations, all based on a common
architecture, that incorporate these critical requirements for the successful delivery and ongoing operation
of various solutions. The three reference configurations are Entry configuration, Mainstream configuration,
and Advanced configuration.
Solution architecture
The set of components consists primarily of software from VMware and hardware from IBM. The Entry
and Mainstream configurations use IBM System x3650 M4 compute nodes. The Entry configuration is
approximately half the compute capacity of the Mainstream configuration. Businesses starting with the
Entry configuration can scale up to the Mainstream configuration in response to an increase in demand.
The Advanced configuration uses IBM System HX5 compute nodes for higher performance and support
for a larger number of virtual machines.
The hardware building blocks consist of:



Networking components
Compute nodes
Storage subsystem
As infrastructures become increasingly complex and heterogeneous, the need for more cost-effective
end-to-end solutions that are easier to manage is also growing. IT organizations are seeking solutions
that can manage and scale across the entire infrastructure. So it is important to develop an architecture
that easily adapts to clients’ businesses needs and supports dynamic growth.
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Figure 2 provides an overview of the reference architecture that enables clients to handle today’s IT
demands.
Figure 2. Reference Architecture solution classification
Usage scenarios
Figure 3 provides a more detailed view for different load characteristics based on the solution components
introduced earlier.
Figure 3. Reference Architecture usage scenarios
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Integration
The three main configurations in the reference architecture are detailed here.
Entry configuration
The Entry configuration is suitable for small organizations with dynamic IT infrastructure needs. In our
reference, IBM Redpaper™ IBM System Storage N series Reference Architecture for Virtualized
Environments, REDP-4865, the Entry configuration supports about 300 users and uses a System
x3550M4 or x3650M4 server. This provides seamless scale-up capabilities such as VM support or
storage.
This configuration can consist of the same components as the Mainstream configuration, but with half the
number of computer servers and with entry level storage, the N3150 or the N3220/N3240. These choices
are more economical for small organizations because they offer the same unified architecture with the full
range of features at a low price point.
Mainstream configuration
The Mainstream configuration is a superset of the Entry configuration, with a seamless scale up of the
Entry configuration for environments that require additional resources. The Mainstream configuration is
suitable for larger organizations than the Entry configuration. In our reference we show an example of a
workload that supports 1500 users.
The component building blocks of the Mainstream and Entry configurations are the same. However, the
Mainstream configuration can also be composed using the HS23 server. The N6240 is the suggested
storage model for this configuration.
Advanced configuration
The Advanced configuration is suitable for larger organizations with increased demands regarding
capacity, speed, and concurrent users. The Advanced configuration uses HX5 servers as the host node
servers. It supports about four times the number of VMs as the Mainstream configuration.
As a stand-alone implementation, the Advanced configuration uses the latest N6270 storage system. The
N6270 offers the second highest capacity and performance in the N series line (second only to the
N7950T). In addition to scalability and performance, the Advanced configuration offers greater flexibility in
terms of consolidating multiple different workloads into a single, highly available storage platform.
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Related information
For more information, see the following documents:

IBM System Storage N series Reference Architecture for Virtualized Environments, REDP-4865
http://www.redbooks.ibm.com/abstracts/redp4865.html?Open

IBM System Storage N series Software Guide, SG24-7129
http://www.redbooks.ibm.com/abstracts/sg247129.html?Open

IBM System Storage N series Hardware Guide, SG24-7840
http://www.redbooks.ibm.com/abstracts/sg247840.html?Open

IBM System Storage N series product page
http://www.ibm.com/systems/storage/network/n6000/appliance/index.html

IBM Offering Information page (announcement letters and sales manuals)
http://www.ibm.com/common/ssi/index.wss?request_locale=en
On this page, enter IBM System Storage N series Reference Architecture for
Virtualized Environments, select the information type, and then click Search. On the next
page, narrow your search results by geography and language.
Designing a Reference Architecture for Virtualized Environments Using IBM System Storage N series
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This document was created or updated on February 6, 2013.
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